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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62ad855e9f53a6f2c4baadd101f218273e1efeb1e69ba3748cac3552f8e5ee1' 
  AND token = 'rFR3q6dt9UZ4Ttwgzy+LLG+7Jqqq3Bawwn2vD5UluRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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