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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71cc33815b11ddf7f0895de13355e1119c4286f381c675f67a54cda9c3807cbf' 
  AND token = 'maFif08n5S9G4q4BxkPdGn/1bcnGnkrVHR22BKTTxB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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