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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac18c2cdffdb09a3bd1bbb5ab612c005ef5144b200e609f80d74a2df6adc72e8' 
  AND token = 'bPAZ30l1hGr9oXEwn/UT8B/LF66Y3s5aw/i6rVtPesQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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