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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1965fa9ae0ed357fc988cf4757d9b2e5baccc1a9cfce5171c9e084910832df6' 
  AND token = 'Mo3kes+VA66Cv/6BOV9661RE0BPAMR3e+tnUGQC//CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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