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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca95f286a2f32f5a96ba74e2990a21c7c8def77d06f2910c7351e3d74ef1e21' 
  AND token = 'tq6J2Kxed4MKYp4aMOZdein3ARaref/pROCD9OACdqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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