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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce653055bc7fcc598bbd1bf178e40a1b5441b4d6c36c0d2be362d5c2190a964' 
  AND token = '+33tqY0yPRvS3VnriG7a9z/V9iYb0RtHJkrJQlpcSzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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