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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c71f4707c9ea7013697709e830a05443c2a80ae318ff661200a34fdade2d151' 
  AND token = 'AXY4obOIicxzEU5erY7SjYsBVGwA/HqIKTCnwH6xjow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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