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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40983179bae4d8a4e0586da161668fa02139c05e6fa106539a62eeb0ec8180cb' 
  AND token = '7Kbyrlm5RkYtdxKeTxtrbWMHVz+Pyvr+GI/RZ7WwsXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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