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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1ad2c0ba324fb6dd727d9134b964d3b435211a73531d9d8e4363f5f3d507d5' 
  AND token = 'VtOOaFK8Ia9HxoZVoBVZ7V9I9i7Z1Ac5SyqBewpFQkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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