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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c00365d1b2ed64dfb905b54887082a92540c6ad9114ed3a956fe165f0bcc9bd4' 
  AND token = 'e2W9xYU/Nd9Oritw6a4sioGeBEejTh0dIAAzbTVESmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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