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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ebb7deb7fa7bbe2fae0b7949b56390234b5e3969b9d6fe2ed62cfe73d4ddc6a' 
  AND token = 'ghmqY4Czwjv30U4lFhkXm39z8POuMfB6IdPWIqvkI1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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