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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47c1658b58df7895df6226690f842b61a1365723bbf264dca9efcaaca936f56' 
  AND token = 'fBrwpiOja1io5l2xhoBOYkDI1pewnNO12Fs5bIXF/3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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