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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fbfb60c94d2c654d03656e7699c928a1a582dd7550c7d81d3276cba6d5fe54e' 
  AND token = '1rR/j42SSacpGqkcZ9i9mWVrj2Vr7K4KvfPP4R9hr0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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