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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f1cb7a871d711ec1ac3311d9587319ff38167ed89f77de2169676ae33f5bd3' 
  AND token = '7Towv5VFBsxV7PfWzEddhpFG0Leog5MkVyszCuSFhDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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