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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29fed0edfb41ccad4b4285ba95422eb1633465a11d1e5adbf0e3df8160055459' 
  AND token = 'QDrYMangfT8Gf8kdN3+hmumoG0+fIc1v2/BHFeqd1VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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