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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b43b1320deb93dcc21a22e56dea36c6aad898716b76b9d2eba62e4520c8c0b' 
  AND token = '+DbQpAOf7/xUTkWPv/xHDKQVxB0xVRw4qwaSatoyH1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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