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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1b595edcc655d13b244ad98c2691f7942757bf61666bafc2e14fb339c36ea4' 
  AND token = '2RMyxYBumHWpbWI/V1MmC9KGCKcc2RvFOjc7IDK5urQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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