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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ada31282859cb0330f11bfc4fdd7fb89efd3e556e9be1affc32198448e1e27' 
  AND token = 'Be9ahsf7CPrnSjg04pxRyHq7Fgf3iPGJIew09gEi6Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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