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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc58b9c844f84faca984848359c744c32177bf577b2560aec88a42e72c2cf6d' 
  AND token = '0gWoQfbDYdCH92hkdj0bUj44QQ0Zq34vAJMs9UI8A+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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