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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c312a1e3f1965ab24f1d1cd50af2cd3f1c99d06a498811a3baeb7d40402c1b0' 
  AND token = 'E8H57iBcO5TtGMZuCl1w9WwNNUX3mVyZatj1aXCRz24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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