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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c19dc1aa76a436c54f3cfc5cb1a3ae70bdfa31393523fd9555b6492dcfff692' 
  AND token = 'TYR+W6R9ssZcF2bYo0+2YTQGe2fWkWGLrcI6+rDHfCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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