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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4851409f6c6445d47ea2d83bf80dde4c7b2c02491dda25e2ce7f577203d5ffaf' 
  AND token = 'jsCR5gW5qJlPHmax1NT72muhspZDm7bkhwp7k0avF84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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