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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ee7d1ba0e0858acbf10407e55606cabc94563314c7c5b0919b4d7669d4a3b0' 
  AND token = 'EphcYwToZIYQypMOnyZsjww2jIAv8f0W0JTMF59u4nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}