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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a37e7492002a7d86b558f4e4d4894178f0cfd158a0e5806b219975ced4ae10' 
  AND token = '2nmkexmSIiSB75DKYDVYBGqt9gmmWUOAP+rnzEHUiVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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