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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98c98e101e3eddeb7526f65ba5dda707558c6c2e44205de98e7bf1fc5f756a0' 
  AND token = 'nNxVzEAZxGOWJ/ZQjS7dMhsiMucP15RhQt/ht1uDdIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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