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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a2ebe95344444d389e188d913bbb77026ebc1fdfd4de74db3e1d7026ad57e1' 
  AND token = 'Fqn0C/vYDC0ARAz/CurwqK+v+1/MW7kZHpgRWogRdWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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