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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba993747508ccec6ad30e4d3dc555bb585bda0c550da0e619806090b8470ba4c' 
  AND token = '4/2MRjIFzhE24kF4is3SD2FToYbT2j3AG1JADMdjXk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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