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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d3c1bfc4d6e91dca70392c6dc0a7ae49fa763b55775f3b576c560fe28ba331' 
  AND token = 'BW1fJVh1J+OQ7sOOYwEa/30ITjPi57+Za3SmdZ0LlRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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