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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ebfbcebb5743636b1ef65507ae9fe867c3cb80ac1f62b8f1e2b3a37bdc7fd3' 
  AND token = '+VDKlPXrF4LSHI/Psjj94a57eSZjfKq+OxKY4DFDpsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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