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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4a0bc8b8dd8695a8bf7c65e57e87b9a6b13539ac1d15257d16b3a6c3a62c89' 
  AND token = 'JpuBhFAtLFvAepgNrgLgP4FzfS1amtdf4aPHiBtvhXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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