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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d779a0031be993e76c9bff338fbdc7bc88de8756e5adede07c7ca4881c2e751' 
  AND token = 'NpYXMajzwKFT9XqvdDuzdr58w6dG09pBRD+woUK1l74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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