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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f7bdac2045d2e70b042ecca3d9afa8246cad8a9aa53cc35ebf0b78045c1ac1' 
  AND token = 'KCqgNooCa7l5+dMpMVtX5wMz6Sm4NARfY9WLH8KV/oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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