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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc638a2fa309a852f38e738508d282b30388ca812779c6e9ba761d0fc93a26a7' 
  AND token = 'H8eQFdZVi/I3JxASqunSRauKtywSCqAaEX22Puv6rVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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