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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393bb480b6c391b3746314d862df4bd28169d6bc43b0a46b1f8adc6ee29497ac' 
  AND token = 'Ew1lAH4gk7fdIAg8imo/RItl9hb0h5gL0Mw9yU2daTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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