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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b028014c670c7449f37ff50b8c1b975150d015c57d3553f5ed6f44b5dac24305' 
  AND token = 'uYRl5M9TZZ0aJBipvD9qi4oaVWAQZn1fBGgpyk2EFOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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