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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c7d9875277a867be83e2c0dd5f684d2b0642bda283554e832b7912e8ea9c5e' 
  AND token = '76atIRm840Az57MtDWVuAHDDQS2kUE3nhAfnmXdmtsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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