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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0090a4abbd47e157e645125b1e8d723273b46084c6e05e96319a3c71f95e5b5' 
  AND token = 'CjVKLFvr/IKYfv6E0t7qZrhSKc9NNFPkW7un7VTtQok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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