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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff699b548d0f13f540c9d4fb7bfc5ec443ae6159c19b0383fd35833820355ba8' 
  AND token = 's67U2pwNugTn4YXU8+Igy27wNBXw/frxFKpJPqcMa98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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