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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba16fd95a1eee19292a5c3009183d72e6b02eea57064e25d639bba0d26c657d5' 
  AND token = 'K6+ms5KMtgNxoy+bnwXDpTpeiNuXPGAwmD1I9ZPi72M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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