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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c7f96af32106ba81b722ab7b7bdd7cef569022343a30ce47ada2c7639c97d75' 
  AND token = 'v4df5mtoQFHCuHgUUFT2vB2Ny8W+QdU3NSrqTZxBYhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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