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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e26351427d348bd770916298a29d087c007083bb4d20a88f6fa8fad9d3a5b7d' 
  AND token = '7q0CtSpTckul4uiBMJLehZYnwnpivGmDhyMUbGc1w0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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