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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0bda3eeafe38f8d5e564ac62ea650cfd16292c8aeae22fb66264e9a1aea31f3' 
  AND token = 'uQ75kUzrTGi8AkW//bhEJ55Iv3KSL6lVi9N1dHvj+i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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