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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4956a46bc270f0eae052d95c36469eefdc97548f65d45274a8095d3816af35c' 
  AND token = 'uQ38JJp+iDeBr/lHw1rFXqFBJsV5M3brHPCMp5fqINA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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