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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c647ffdd5390155a4ad1509c7216fd679934a87d6f22fc98d933509786e0bc97' 
  AND token = 'aHYQWXiH36BGAq8Bi9yeTfEqK8kXW/coJKKUoGC32Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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