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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ed044c2da62c578aca9deab76b379d16c732471c200f308429f7946e12e3ce' 
  AND token = 'kCPJCtqr6mz7/Oj7gvLvHW4AAQP8mQ8uKawBScVdjI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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