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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e155a36e6b31b547622d1174da48e97dd6d989867a9b7da36ed824a9949631' 
  AND token = 'f9rvJ7BnsstRijB0k22Zmlx30Qa/4je8rCn7Uex6G5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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