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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68fb982b4430c1daf4a92ec825f8ddd357f1bd51e88c17d3bd12d0968d2cf689' 
  AND token = 'aCv7+t3AFPuCNkXHiic8YM5N745nERAk2I4ReTqBLVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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