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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a0d143b0af52c2edacb0fb0378b37dfcbc37a0b27c888903d85a86744d2e92' 
  AND token = '2GdPA9EMVpD0ws2axAyBvzQY5/yN7EQoubuV422UcGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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