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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796f9aa8f6160e42afe567e82e3c2fa5c364bff3b10c43354b58ac6cf7eb542f' 
  AND token = 'qpSIoEiS8YaktaM3DklNx+qVpOah5CEJNj2fxYdqumk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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