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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b652a8b330325e13a1c06bdeeacb50c417a488dacbdad62f97d1daf22e1d12' 
  AND token = 'Z2tXdGGYxh2R0WHWlMHB71lyV61nhgi3Rvb4Pi+dYEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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