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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d4cbb8cc1b4224e569748d086aaf334ae3bd705483b5d3ea59f8f49eaf5788' 
  AND token = 'r6qBo6JcejR/2NBq+JWQa9048nsVAnv6fESUstJP+Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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