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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3a4e8e8152a5e8d26f01d4ec5e69ed833f8a1e0d876231c2face869254c0d0' 
  AND token = '+lo0cCgJVzBwyNW5QLBuQ3lyOJCV/fBe3ZYHTN4Gt/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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