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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff44083e33f3a3cb1e34574a13cdd7f557231529d895d55ba1dbd10b1e33e32' 
  AND token = 'RGA0H1QKU3NoWlqdM9M2du0PAS/5N10R7PfkCA9F288=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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