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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b3b2f54b548b63958cbde5bf9c76204609c565a0415542454fe2ceebd119dd8' 
  AND token = '8faVp8I2dUtxT74HVB+U2ShTiSBXotBGv0dmGWnLxN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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