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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be28663f19cf32fca7e5bd123cb731d08be00addc004f530929192f9a0fba8d7' 
  AND token = 'mfYH95wvSvUUUioxO90m635D/BMLpxTKKzfjYAn8vD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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