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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d93891d296358c3ebf84e7dc73d87d138681400043a6991cf4f55c8d4e768b4' 
  AND token = 'jgchhYXhAQC1RLMblq98vdjX9In6x65JT2Tn+OqlG9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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