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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ff6551e5ff745a1f0ec843835535c4484ba817c170a018fb4d345b540c11f5' 
  AND token = 'RrT9e01jDPTC0DZsVGtrKI0u+lJ+UmJnkQm0p3QESUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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