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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14a89c0a1c06809b8a1e0a70ea98e433bcee35e96bbd7f8e8bc8e780a692c59' 
  AND token = 'EflpLp+sxFHGZgeilKZ6vKMw6F2yoXeKGhY72mLBjuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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